Wisconsin had a large swing to Biden yesterday as first reported by a A+ pollster.
I said yesterday that even the pollster has a A+ rating, I still need further information to confirm this surprise big swing.
Now, with your information, even Trafalgar also said Trump down 17 points in Wisconsin, then I conclude that there has been a big swing in Wisconsin and Biden has taken a comfortable lead.
Trafalgar is a GOP poll can be seen, for example, by the teo labels used in RCP poll list: Trafalgar (R)*